Bug 1258802 (CVE-2015-6806) - CVE-2015-6806 screen: Stack overflow due to deep recursion causing process freeze
Summary: CVE-2015-6806 screen: Stack overflow due to deep recursion causing process fr...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2015-6806
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1258806
Blocks: 1258805
TreeView+ depends on / blocked
 
Reported: 2015-09-01 10:24 UTC by Adam Mariš
Modified: 2019-09-29 13:36 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-11-05 04:04:12 UTC
Embargoed:

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Description Adam Mariš 2015-09-01 10:24:33 UTC 
A vulnerability was found in screen causing stack overflow which results in crashing the screen server process. After running malicious command inside screen, it will recursively call MScrollV to depth n/256. This is time consuming and will overflow the stack if 'n' is huge.

CVE assignment:

http://seclists.org/oss-sec/2015/q3/485

Upstream patch:

http://git.savannah.gnu.org/cgit/screen.git/commit/?id=c336a32a1dcd445e6b83827f83531d4c6414e2cd

Upstream report (contains reproducer):

https://savannah.gnu.org/bugs/?45713
Comment 1 Adam Mariš 2015-09-01 10:28:27 UTC 
Created screen tracking bugs for this issue:

Affects: fedora-all [bug 1258806]
Comment 3 Petr Hracek 2015-12-21 09:14:53 UTC 
Shall I fix the screen bug or close it as WONTFIX too?

Why is this bug closed as WONTFIX?
Comment 4 Adam Mariš 2015-12-21 09:58:45 UTC 
(In reply to Petr Hracek from comment #3)
> Shall I fix the screen bug or close it as WONTFIX too?
> 
> Why is this bug closed as WONTFIX?

This issue is not planned to be fixed in RHEL due to Low security impact.
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